Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/1964#issuecomment-53129462
Good Morning @erikerlandson,
Thank you for telling me the documentation.
But I can not compile, if I changed the code in ChebyshevDistanceMetric.
I guess that breeze.numerics doesn't have abs() for a vector.
Although I read the source code of Breeze, I couldn't find.
## Sample Change
```
before: val diff = (v1 - v2).map(Math.abs)
after: val diff = abs(v1 - v2)
```
## Error Message
```
Error:(99, 19) ambiguous implicit values:
both method mapUFuncImpl in object Vector of type [Tag, V, U](implicit
impl: breeze.generic.UFunc.UImpl[Tag,V,U], implicit canMapValues:
breeze.linalg.support.CanMapValues[breeze.linalg.Vector[V],V,U,breeze.linalg.Vector[U]])breeze.generic.UFunc.UImpl[Tag,breeze.linalg.Vector[V],breeze.linalg.Vector[U]]
and method fromLowOrderCanMapValues in trait MappingUFunc of type [T, V,
V2, U](implicit handhold: breeze.linalg.support.CanMapValues.HandHold[T,V],
implicit impl: breeze.numerics.package.abs.Impl[V,V2], implicit canMapValues:
breeze.linalg.support.CanMapValues[T,V,V2,U])breeze.numerics.package.abs.Impl[T,U]
match expected type
breeze.numerics.abs.Impl[breeze.linalg.Vector[Double],VR]
val diff = abs(v1 - v2)
^
```
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